Huawei SUN2000-15KTL-50KTL-M3 Series User Manual page 31

Replacing SUN2000-(15KTL-50KTL) Series with
SUN2000-(15KTL-50KTL)-M3 Series
User Manual
ID Name
313 Low
insulation
resistance
318 Abnormal
residual
current
321 Cabinet
overtemp
erature
326 Abnormal
grounding
Issue 01 (2021-04-05)
Severity Cause
Major Cause ID = 1
 The PV array is
short-circuited with PE.
 The PV string is installed in
a moist environment for a
long time.
Major Cause ID = 1
The insulation resistance
against the PE cable at the
input side decreases when the
inverter is operating, which
causes an excessively high
residual current.
Major Cause ID = 1

The inverter is installed in a
place with poor ventilation.

The ambient temperature
exceeds the upper
threshold.
 The internal fan is faulty.
Major Cause ID = 1
 The neutral wire or PE
Copyright © Huawei Technologies Co., Ltd.
Solution
underfrequency protection
thresholds with the consent of
the local power operator.
 Cause ID = 5
1. If the alarm occurs
occasionally, the power grid
may be abnormal temporarily.
The inverter automatically
recovers after detecting that
the power grid becomes
normal.
2. If the alarm persists, check
whether the power grid
frequency is within the
acceptable range. If not,
contact the local power
operator.
1. Check the impedance between the
PV string and the PE cable. If a
short circuit occurs, rectify the
fault.
2. If you have confirmed that the
impedance is less than the default
value in a cloudy or rainy
environment, log in to the app,
SmartLogger, or NMS and set
Insulation resistance protection
threshold.
1. If the alarm occurs accidentally,
the external power cable may be
abnormal temporarily. The
inverter automatically recovers
after the fault is rectified.
2. If the alarm persists or lasts a
long time, check whether the
impedance between the PV string
and ground is too low.
1. Check the ventilation and
ambient temperature at the
inverter installation position.
2. If the ventilation is poor or the
ambient temperature exceeds the
upper threshold, improve the
ventilation and heat dissipation.
3. If the ventilation and ambient
temperature are normal, contact
Huawei technical support.
1. Check whether the neutral wire
and PE cable of the inverter are
properly connected.
9 Maintenance
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